When solid NH4HS is placed in a closed flask at 28oC, the solid dissociates according to the equation below. NH4HS(s) ⇄ NH3(g) + H2S(g). The total pressure of the equilibrium mixture is 0.766 atm. Determine Keq at this temperature.

0.147

Explanation:

is the constant of a certain reaction at equilibrium.

For the given chemical reaction:

at t= 0       0                                           0               0

at eqm                                                   p                p

Total pressure = p+p = 0.766 atm

2p= 0.766 atm

p= 0.383 atm

The expression of for above equation follows:

We are given:

Thus at this temperature is 0.147

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